update to new sofia snapshot.  This fixes several race conditions, ref count problems, and double frees that were happening in the sofia library and fixes segfaults under heavy load and a segfault on cancel when using 100rel while awaiting a prack.  Sofia should be much more stable now, please beat it up and let us know.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3220 d0543943-73ff-0310-b7d9-9358b9ac24b2